2000 YAMAHA SR125 stop start

3-1
3
EAU00027
3-INSTRUMENT AND CONTROL FUNCTIONS
EAU00029*
Main switch/steering lockThe main switch controls the ignition
and lighting systems. Its operation is
described below.
EAU00036
ON
Electrical circuits are switched on. The
engine can be started. The key cannot
be removed in this position.
EAU00038
OFF
All electrical circuits are switched off.
The key can be removed in this posi-
tion.
EAU00040
LOCK
The steering is locked in this position
and all electrical circuits are switched
off. The key can be removed in this po-
sition.
To lock the steering, turn the handle-
bars all the way to the left. While push-
ing the key into the main switch, turn it
from “OFF” to “LOCK” and remove it.
To release the lock, turn the key to
“OFF” while pushing.
EW000016
WARNING
@ Never turn the key to “OFF” or
“LOCK” when the motorcycle is
moving. The electrical circuits will
be switched off which may result in
loss of control or an accident. Be
sure the motorcycle is stopped be-
fore turning the key to “OFF” or
“LOCK”. @1. Push
2. Turn
E_3mw.book Page 1 Monday, February 5, 2001 9:54 AM

INSTRUMENT AND CONTROL FUNCTIONS
3-3
3
EAU00127
Turn signal switch
To signal a right-hand turn, push the
switch to “ ”. To signal a left-hand
turn, push the switch to “ ”. Once the
switch is released it will return to the
center position. To cancel the signal,
push the switch in after it has returned
to the center position.
EAU00129
Horn switch “ ”
Press the switch to sound the horn.
EAU00138
Engine stop switch
The engine stop switch is a safety de-
vice for use in an emergency such as
when the motorcycle overturns or if
trouble occurs in the throttle system.
Turn the switch to “ ” to start the en-
gine. In case of emergency, turn the
switch to “ ” to stop the engine.
EAU00143
Start switch “ ”
The starter motor cranks the engine
when pushing the start switch.
EC000005
CAUTION:@ See starting instructions prior to
starting the engine. @
1. Engine stop switch
2. Start switch “ ”
E_3mw.book Page 3 Monday, February 5, 2001 9:54 AM

INSTRUMENT AND CONTROL FUNCTIONS
3-10
3
EAU00332
Sidestand/clutch switch
operation checkCheck the operation of the sidestand
switch and clutch switch against the in-
formation below.
EW000046
WARNING
@ l
Be sure to use the centerstand
during this inspection.
l
If improper operation is noted,
consult a Yamaha dealer.
@CD-08E
CD-08E
TURN MAIN SWITCH TO “ON” AND
THE ENGINE STOP SWITCH TO “ ”.TRANSMISSION IS IN GEAR AND
SIDESTAND IS UP.PULL IN CLUTCH LEVER AND
PUSH START SWITCH.ENGINE WILL START.
SIDESTAND IS DOWN.ENGINE WILL STALL.SIDESTAND SWITCH IS OK.CLUTCH SWITCH IS OK.
E_3mw.book Page 10 Monday, February 5, 2001 9:54 AM

OPERATION AND IMPORTANT RIDING POINTS
5-2
5
CF-31E
TURN THE MAIN SWITCH TO "ON" AND THE
ENGINE STOP SWITCH TO “ ”.
IF THE TRANSMISSION IS IN NEUTRAL AND THE
SIDESTAND IS DOWN,PUSH START SWITCH.
THE ENGINE WILL START.RETRACT THE SIDESTAND AND PUT THE
TRANSMISSION IN GEAR.
IF THE TRANSMISSION IS IN GEAR AND THE
SIDESTAND IS UP,PULL IN THE CLUTCH LEVER AND PUSH THE
START SWITCH. THE ENGINE WILL START.
THE MOTORCYCLE CAN BE RIDDEN.
THE MOTORCYCLE CAN BE RIDDEN.
E_3mw.book Page 2 Monday, February 5, 2001 9:54 AM

OPERATION AND IMPORTANT RIDING POINTS
5-3
5 1. Turn the fuel cock to “ON”.
2. Turn the main switch to “ON” and
the engine stop switch to “ ”.
3. Shift the transmission into neutral.
NOTE:@ When the transmission is in neutral, the
neutral indicator light should be on. If
the light does not come on, ask a
Yamaha dealer to inspect it. @4. Turn on the starter (choke) and
completely close the throttle grip.
5. Start the engine by pushing the
start switch.NOTE:@ If the engine fails to start, release the
start switch, wait a few seconds, then
try again. Each attempt should be as
short as possible to preserve the bat-
tery. Do not crank the engine more
than 10 seconds on any one attempt. @
6. After starting the engine, move the
starter (choke) to the halfway posi-
tion.NOTE:@ For maximum engine life, never accel-
erate hard with a cold engine! @7. After warming up the engine, turn
off the starter (choke) completely.NOTE:@ The engine is warm when it responds
normally to the throttle with the starter
(choke) turned off. @
EAU01258
Starting a warm engineThe starter (choke) is not required
when the engine is warm.
EC000046
CAUTION:@ See the “Engine break-in” section
prior to operating the motorcycle for
the first time. @
E_3mw.book Page 3 Monday, February 5, 2001 9:54 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-9
6 4. Remove the filter cover screws,
drain bolt and the oil filter cover
and oil filter.
5. Clean the oil filter and strainer with
solvent. Replace if necessary.
6. Check the O-rings. If damaged, re-
place it.
7. Install the drain bolt, filter cover
screws and drain bolt. Then tight-
en to the specified torque.
NOTE:@ Make sure the O-ring is seated proper-
ly. @
EC000071*
CAUTION:@ Before reinstalling the oil drain bolt,
do not forget to install the O-ring,
compression spring, and oil strainer
in position. @8. Fill engine with oil. Install the oil fill-
er cap and tighten.
EC000066
CAUTION:@ l
Do not put in any chemical addi-
tives. Engine oil also lubricates
the clutch and additives could
cause clutch slippage.
l
Be sure no foreign material en-
ters the crankcase.
@9. Start the engine and warm up for a
few minutes. While warming up,
check for oil leakage. If oil leakage
is found, stop the engine immedi-
ately and check for the cause.
10. Stop the engine and check the oil
level.
1. Filter cover screw (´ 2)
2. Engine oil drain bolt B
Tightening torque:
Drain bolt A:
43 Nm (4.3 m·kg)
Filter cover screw:
7 Nm (0.7 m·kg)
Drain bolt B:
10 Nm (1.0 m·kg)
Recommended oil:
See page 8-1.
Oil quantity:
Total amount:
1.3 L
Periodic oil change:
1.0 L
With oil filter replacement:
1.1 L
E_3mw.book Page 9 Monday, February 5, 2001 9:54 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-11
6
EAU00629
Carburetor adjustmentThe carburetor is a vital part of the en-
gine and requires very sophisticated
adjustment. Most adjustments should
be left to a Yamaha dealer who has the
professional knowledge and experi-
ence to do so. However, the following
may be serviced by the owner as part
of routine maintenance.
EC000094
CAUTION:@ The carburetor was set at the
Yamaha factory after many tests. If
the settings are changed, poor en-
gine performance and damage may
result. @
EAU01168
Idle speed adjustmentNOTE:@ A diagnostic tachometer must be used
for this procedure. @1. Attach the tachometer. Start the
engine and warm it up for a few
minutes at approximately 1,000 to
2,000 r/min. Occasionally rev the
engine to 4,000 to 5,000 r/min.
The engine is warm when it quick-
ly responds to the throttle.2. Set the idle to the specified engine
speed by adjusting the throttle
stop screw. Turn the screw in di-
rection
a to increase engine
speed and in direction
b to de-
crease engine speed.
NOTE:@ If the specified idle speed cannot be
obtained by performing the above ad-
justment, consult a Yamaha dealer. @1. Throttle stop screwStandard idle speed:
1,300 ~ 1,400 r/min
E_3mw.book Page 11 Monday, February 5, 2001 9:54 AM